Exercise apparatus



FIG. 1 illustrates a perspective view of the claimed design for an exercise apparatus;

FIG. 2 illustrates a right-side view thereof;

FIG. 3 illustrates a left-side view thereof;

FIG. 4 illustrates a front view thereof;

FIG. 5 illustrates a rear view thereof;

FIG. 6 illustrates a top view thereof; and,

FIG. 7 illustrates a bottom view thereof. 

The ornamental design for an exercise apparatus, as shown and described. 